The sermon centers on the profound unity between Christ, the sanctifier, and believers, the sanctified, emphasizing that through His incarnation, perfect life, sacrificial death, and resurrection, Jesus has made His people one with Him, with God, and with one another. Drawing from Hebrews 2 and related passages, it highlights Christ's necessity to become fully human—born of the Virgin Mary, subject to the law, and obedient to the point of death—so He could fulfill the law, bear the guilt of sin, and satisfy divine justice on the cross. This dual work of justification—declaring believers righteous—and sanctification—making them holy—rests entirely on Christ's finished sacrifice, which eradicates sin's penalty and transforms the believer's identity. The preacher underscores the astonishing grace of Christ, who, despite humanity's failure and shame, is not ashamed to call believers His brethren, inviting a life of faithful obedience and joyful worship in response to such unparalleled love.